Actually, yes. Any content uploaded to any graal server, becomes Graal's property.
This is a failsafe for say, if Billy staffed a playerworld, made 99% of the things they used, and then got into a massive fight with PW staff or something, Billy couldn't destroy the server by taking all of his **** because he made most of the content used.
Sure, you could technically try to sue Billy, but I'm not sure what court would actually review that case. And Billy would be able to argue fair use, considering he edited the piece as well as stole it.